went through the Bain tech team loop earlier this year for a senior SWE role. sharing everything because when i was prepping i found almost nothing specific about their eng process.
background: 8 YOE, backend/distributed systems. applied through LinkedIn, recruiter reached out within a week.
the stages: recruiter phone screen (30 min) - purely logistical, they want to know your timeline, visa status if relevant, and whether you understand this is not a consulting role. they keep stressing that. a lot. online assessment - HackerRank platform, 2 coding problems, 90 minutes. medium difficulty. i got a graph BFS problem and a string manipulation one. nothing crazy, but timed and unproctored. technical phone screen (60 min) - one interviewer, one leetcode-style question (medium, trees), then a 20-min discussion about a system you've built. pretty standard but the system design discussion was more conversational than a formal round. final round (onsite, done virtually now) - this was 4.5 hours across 4 sessions: two more coding rounds (one medium, one medium-hard), a system design, and a behavioral/values session. the system design was the longest, around 70 minutes.
timeline: 5 weeks start to finish. they were responsive, no ghosting between stages which was refreshing.
leveling felt vague throughout. i asked directly and got a non-answer. offer came in at "senior software engineer" but the internal band system isn't published.
one thing that stood out: the interviewers were all smart but most came from non-consulting backgrounds. the eng org genuinely feels separate from the case-interview consulting world. don't conflate the two.
happy to answer specifics below.